Used during evacuation, charging and recovery procedures.

Low pressure is blue, High pressure is red.

High side is 0 to 500 PSIG; Low side is 0 to 350 PSIG and 0 to 30 in. Hg below atmospheric pressure.

High pressure, liquid.

Liquid, high pressure.

Low pressure vapor.

In the evaporator.

Superheated vapor.

If the compressor is located in the coldest location in the circuit.

Operating while in a deep vacuum or when the service valves are closed.

A compressor burnout or if the unit has had a leak.

No.

Recover and recycle used refrigerants.

Pump size, hose length, hose diameter, size of system to be evacuated, ambient temperature, suction line size, and the amount of moisture in the system.

Use the shortest length and the largest diameter possible for the quickest evacuation. At least as large as the vacuum pump inlet.

Reduces emissions, pressure drop and evacuation time.

The vacuum pump inlet.

Time is reduced.

To speed up moisture removal.

Yes.

The oil will form hydrofluoric and hydrochloric acids which will corrode the internal parts of the system.

No damage will be done.

Vacuum reading will rise when vacuum pump is turned off.

As far away as possible.

Turn it off and valve it off.

3 atoms of oxygen. It blocks much of the harmful ultraviolet radiation (uv-b) emitted from the sun and it keeps our earth's temperature stable.

One atom can destroy 100,000 ozone molecules.

The ability of any chemical to deplete the ozone layer.

Chlorofluorocarbon.

R-11,12,113,114.

Chlorine.

Hydrochlorofluorocarbons.

R-22,123.

CFC's.

Chemical strength, they will not breakdown in the lower atmosphere.

A fluorocarbon that contains no chlorine.

R-134a,404a,407c,410a.

Zero.

CFC's and HCFC's.

CFC's.

HCFC's, HFC's are zero.

A mixture of two or more compounds where the mixture behaves like a single chemical.

Yes

It helps.

Chlorine-monoxide.

The increase in chlorine and fluorine present in the stratosphere, matches the increase in emissions of CFC's.

From high altitude air sampling measurements.

It blocks much of the harmful ultraviolet radiation (uv-b).

Skin cancer, cataracts, human immunity is reduced.

Timber growth is reduced, crop yields lowered, marine life and the food chain are impaired.

A global problem.

A treaty that called for the reduction of production of CFC's.

Ozone depleting compounds, CFC's, HCFC's, and Halons.

In the U.S., after December 31, 1995.

Through recovery of existing refrigerants.

Taxes on production and use, standards set for the recovery of refrigerants.

Venting.

No. Cities or states can create their own laws but they must be at least as strict as federal laws.

Allows states and municipalities to create their own laws to prevent and monitor the release of CFC and HCFC materials into the atmosphere.

Prevents stratospheric ozone depletion.

Standards to be set for recovery of all refrigerants prior to appliance service and disposal.

Knowingly venting CFC's, HCFC's and their substitutes.

All refrigerants as of 11-15-1995.

Any knowingly vented refrigerants.

July 1, 1992.

Any device which contains and uses a class 1 or class 2 substance as a refrigerant and is used for household or commercial purposes.

For adding or removing refrigerant from the appliance.

EPA.

A recovery machine that has its own compressor to pump refrigerant out of the system.

Low pressure.

High pressure.

20 pounds.

Recover refrigerant or verify that the refrigerant was previously recovered.

The final person in the disposal chain. (Scrap metal recyclers, landfill owner, etc)

Fines up to $27,500 per violation per day and possible loss of technician certification.

Up to $10,000.

May result in revocation of the technician's certification.

Recovery.

Recycling.

Reclaim.

Chemically tested to ARI Standard 700, the purity level of factory new refrigerant.

Electronic leak detector and Ultrasonic detector.

Dry nitrogen.

Leaks.

Recover into a separate container?

No.

Insure that liquid is not trapped between service valves.

Increases recovery time.

That all service personnel are duty bound to follow the law and protect the environment.

Because they are blended, the ingredients will leak at different rates.

A family of lines depicting pressure versus temperature curve.

A blend of three different refrigerants.

In liquid form into the high side of the system.

No.

Recover the remaining 134a and then pressurize the system with nitrogen and a trace charge of R-22 so you can use an HCFC electronic leak detector.

Ployolester.

No.

Oil that absorbs moisture easily.

Depends on the blend: For HCFC's-Alkylbenze, For HFC's-Ployolester.

When operating recovery or recycling devices and when handling and refilling refrigerant cylinders.

Pressure regulator.

All of them.

A sheet the states the safety ratings and precautions to be taken for use and handling of chemicals.

A1.

Heart irregularities or Asphyxia.

Oxygen deprivation.

Asphyxia.

With alcohol spray.

It must be replaced.

Unit data plate.

No. Oxygen in the presence of oil under high pressure can be explosive.

Refrigerant will decompose into a toxic material, venting of refrigerant int the atmosphere or the tank may explode.

For virgin refrigerant from the manufacturer.

Reduced to at least 0 PSIG.

No.

Puncture the container before disposal.

Properly secured at all times.

Gray with a yellow top.

80%.

Hydrostatic pressure could cause the cylinder to explode.

Floats, thermistor type sensors, and weighing scales.

Every five years.

Federal code of regulations title 49 (parts 100-177) states this.

DOT classification tag.

For transportation purposes.

In a vertical or upright position with their valves at the top.

Appliances typically charged at the factory with five pounds or less of refrigerant. Refrigerators and freezers designed for home use, room air conditioners, including window and PTAC units, package heat pumps, dehumidifiers, under the counter ice makers, vending machines and drinking water coolers.

Repair of leaks on small appliances is not required, but leaks should be repaired whenever possible.

Type 1 or Universal.

Access tubes or process tubes.

Low-loss fitting. (shut-off valve)

To prevent loss of refrigerant.

CFC, HCFC and HFC refrigerant.

No.

HFC-134a.

Check for non-condensables and the type of refrigerant.

To find the correct pressure for that temperature on a T/P chart.

77 PSIG.

Only when the person is working on a small appliance.

No.

Yes.

In a system dependent recovery with a non-operating compressor?

Yes.

Must be able to recover 80% of the refrigerant if the compressor is inoperative or 90% if the compressor is operative. Must be EPA certified.

80%, 90%.

Yes.

Type 1.

It must be recovered.

Check which refrigerant is being used.

System dependent recovery machines rely on the compressor of the system being serviced, or the pressure of the refrigerant to pump the refrigerant into a recovery drum.

Evacuate or cool a cylinder. Connect the high and low hoses to the system. Pull refrigerant into the cylinder with vacuum or the low tank pressure.

When there is an inoperative compressor on the system or when necessary to reach required recovery levels.

It speeds up recovery, improves efficiency and may be necessary to reach required recovery levels.

Access the high side and run the compressor.

High side valve.

A recovery container that is not properly evacuated or one that has unopened valve.

To speed up refrigerant release from the oil.

Any time oil is removed from a large system and on small appliances when using system dependent recovery with a non-operating compressor.

Helps to free refrigerant that may be trapped in the oil.

Refrigerant leaks.

In theory yes, but unlikely. First it would have to be certifiable, second it would have to be connected to a non-pressurized recovery container.

No.

Different refrigerants must be placed in recovery vessels containing the same type of refrigerant.

They may either refuse to process and return it at owner's expense or agree to destroy the refrigerant for a substantial fee.

Use DOT approved cylinders.

Department of Transportation (DOT).

When you are connecting and disconnecting hoses.

To allow access to the sealed system for recovery.

Copper or aluminum refrigerant lines.

It should be capped after any service procedure.

To prevent leaks.

Periodically checked for leaks and replaced if damaged.

It might mean acids are present due to a compressor burnout.

Tubing flushing might be required.

0 PSIG.

Floats, thermistor-type sensors and weighing scales.

Refrigerants will replace air in a confined space leading to possible oxygen starvation.

Self contained breathing apparatus.

Ventilate the space and leave the area.

Hydrochloric and hydrofluoric acids and phosgene gas.

Nitrogen tanks should be equipped with a regulator.

Shipping papers must indicate the refrigerant type and number of cylinders.

Department of Transportation (DOT).

Filter-driers.

To permit a check of moisture content in the system.

Allows flow through the main line while closing the access port.

Increase discharge pressure.

Oil that is mixed with refrigerant will foam in the compressor crankcase.

Compressor burnout or if the unit has had a leak.

It can cause moisture to freeze in the system?

At the outlet of the condenser.

-15 degrees F.

No.

HCFC-22.

Liquid, high pressure.

Charged in liquid state.

High side.

Should pull a vacuum of 500 microns.

73 PSIG.

Microns.

On the suction line before the compressor.

33 PSIG

Dry nitrogen.

To reduce the amount of refrigerant in the lubricating oil.

By the filter-drier.

Bubble solution.

Stains around tubing and fittings.

Undercharged system, possibly the result of a leaky system.

R-22.

Recover remaining 134a, pressurize the system with nitrogen and a trace charge of R-22 so you can use an HCFC electronic leak detector.

For a visual check for leaks.

Refrigerant leaks.

Effective 6/14/93, any leak rate of 35% or more on equipment with 50 lbs. of charge or more must be repaired. Less than 35% is permissible.

Less than 15% annually.

By the equipment data plate.

Liquid.

To the liquid line.

Vapor recovery bust be performed.

Oil and unwanted contaminants from the system to the recovery machine and recovery drum.

Cooled.

Clean out all residual refrigerant, change oil, replace filters, evacuate machine by pump-out or another machine.

Oil.

Moisture.

Municipal water tap.

Suction line.

Liquid line.

All solenoid valves should be open.

To prevent loss of refrigerant when connecting and disconnecting hoses.

No airflow over the compressor body or no suction gas flow over the internal motors, or a combination of the two.

To prevent overheating the compressor motor.

To prevent overheating the compressor motor.

On small appliances as long as the device meets EPA standards and the technician adheres to the servicing procedures specified for the recovery equipment. Cannot be used on systems with more than 15 lbs. of refrigerant.

10 inches of Hg.

Any repair that involves the removal of the compressor, evaporator, condenser, or any auxiliary heat exchanger coil.

15 inches of Hg.

4 inches of Hg.

if leaks are in the system or if recovery to target levels would contaminate the refrigerant.

It must be evacuated of all non-condensables.

Reused in the original system or transferred to another system with the same owner after it is checked so that it is free of non-condensables.

To the liquid line.

It isolates the refrigerant that must be recovered from the rest of the system.

All refrigerants.

A pressure relief device.

Parrallel.

To limit the outlet pressure of the nitrogen cylinder.

Cleaned with an alcohol spray.

Slightly above atmospheric pressure.

Raises head pressure.

A leak or major component failure (compressor burnout).

To prevent freeze-up of the water as pressure is reduced on the refrigerant.

The evaporator charging valve.

At the evaporator.

15 PSIG.

Outdoor for venting.

Liquid through the evaporator charging valve.

Above freezing, typically 36 deg. F.

16.9 inches of Hg.

Can cause system water to freeze.

Minimize the effects of contamination. To remove non-condensables.

Gaskets and fittings.

The inlet of the purge unit is typically connected to the top of the condenser.

The inlet of the purge unit is typically connected to the top of the condenser.

It removes non-condensables that contain a low percentage of refrigerant. This adds to the value of the purge drum in refrigerant containment.

Refrigerant leaks.

By regular leak checking and repairing any leaks on a regular schedule.

10 PSIG on low pressure equipment that utilizes a rupture disk.

By increasing the refrigerant pressure using an external heat source or running hot water through the chiller tubes not to exceed 10 PSIG.

The chiller barrel can be emptied of all water and a leak check can be made at the drain valve with the water off. If the tubes themselves require a leak check, the check can be made with a hydrostatic tube test kit.

To check for leaks in a chiller tubes.

Effective 6/14/93, any annualized leak rate of 35% or more on equipment with 50 lbs. of charge or more must be repaired. Less than 35% is permissible.

For appliances with 50 lbs. of charge or more an annual leak rate of 15% or more must be repaired. Less than 15% leak rate is permissible.

Starting at 1mm of Hg., after 12 hours the vacuum reading should not increase to more than 2.5 mm of Hg.

Regular leak checks and repair any leaks.

To prevent moisture form being drawn into the refrigerant circuit.

Leaks.

Leaks between the refrigerant circuit and the water circuit.

To vaporize any liquid refrigerant that might be trapped in the oil.

Vapor recovery must be performed.

Start with liquid removal.

Local water supply.

10 PSIG, because the rupture disk is set to open at 15 PSIG.

Any repair that involves the removal of the compressor, evaporator, condenser, or any auxiliary heat exchange coil.

25 inches of Hg.

To see if refrigerant is still trapped in the system.

If the recovery would contaminate the refrigerant being recovered. (this level cannot exceed 0 PSIG.)

No.

Yes.

25 inches of Hg, 25 mm of Hg. Absolute (equal to about 29 inches of Hg.)

It can cause moisture to freeze in the system.

You can raise the pressure with nitrogen and allow the ice to melt, then continue with the evacuation.

Parallel.

All refrigerants.

May not exceed the TLV-TWA. (Threshold limit value-Time weighted average.)

1. Use refrigerant sensors in equipment room. 2. Avoid siphoning refrigerant by mouth. 3. Wear butyl-lined gloves. 4. Wear safety glasses.

B1.